We have measured the temperature dependence of the hydrogen spin lattice relaxation time in the hydride (β, β′, γ, δ) and solid solution phases of the Mg2NiHx system. These gave the temperature ranges of the various phases. The hydrogen diffusion activation energy for the β, β′, γ and δ hydride phases were found to be 10.6±0.4, ?17, 12.0±0.3 and ?20 kcal/mole, respectively, and 8.7±0.7 kcal/mole for the α phase solution.
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Goren et al. (1980) studied this question.
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